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Tuesday, October 27 • 17:15 - 18:05
VM Forking & Hypervisor-Based Fuzzing with Xen - Tamas K Lengyel, Intel Corporation

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In this talk we'll discuss Xen's new VM forking feature and the memory sharing subsystem it uses to achieve lightning-speed VM deployment. Forking a VM lends itself for use-cases where short-lived but identical VMs are useful, such as fuzzing. Using a hypervisor for fuzzing allows us to poke at code-locations that normally would be difficult or slow to fuzz, like the operating system itself. Without having to reboot the VM to recover it after a crash, fuzzing of the kernel and kernel modules can be achieved at great speed. We'll walk through the integration and harnessing required to start fuzzing a Linux kernel module using AFL on Xen. We'll further discuss other potential applications that are now achievable by combining Xen's VMI capability with VM forks. The presentation has been previously given at Xen Project Developer Summit 2020. This version of the talk will focus less on the hypervisor implementation details and more on the application of the system to fuzz various targets, such as system calls, kernel internal interfaces and even user-space applications.

avatar for Tamas K Lengyel

Tamas K Lengyel

Senior Security Researcher, Intel
Tamas works as Senior Security Researcher at Intel. He received his PhD in Computer Science from the University of Connecticut where he built hypervisor-based malware-analysis and collection tools. In his free time he is maintainer of the Xen Project Hypervisor's VMI subsystem, LibVMI... Read More →

Tuesday October 27, 2020 17:15 - 18:05 GMT
Linux Systems Theater
  Linux Systems, Testing & Fuzzing